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Heir to the Austro-Hungarian throne; his assassination on June 28, 1914, in Sarajevo started the war.
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Emperor of Russia; abdicated in March 1917 during the Russian Revolution.
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It started on July 28, 1914, when Austria-Hungary declared war on Serbia after the assassination of Archduke Franz Ferdinand. It ended on November 11, 1918, when Germany signed the Armistice of Compiègne, stopping the fighting.
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Emperor of Germany; supported Austria-Hungary and led Germany during the war.